I have to do the exhaust gaskets on my 3406C, it has round port heads, I haven't called a teps dealer to get a price on OEM parts, but I have heard that guys are really liking Bully dog gaskets and studs, have any of you guys used their stuff , or have any insights, before Cat outsourced everything to China I was a Genuine Cat or nothing guy, but I have had some awful crap from the Cat house lately so I am a bit Shy about paying the price there